Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Kalshi UK) Pick polygram.ink (preferred broker) |
99% | 1% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
99% | 1% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| December 31 | 99% |
| October 31 | 98% |
| August 31 | 95% |
| July 31 | 85% |
| July 24 | 49% |
| July 22 | 4% |
| July 17 | 0% |
| July 16 | 0% |
Market context
Anthropic’s next Claude Opus model is expected to reach general public access before the end of 2026, a timeline that underpins the 96% YES probability currently pricing this contract on Polymarket. Traders holding USDC on Polygon see conditional tokens reflecting near-certainty, as the market treats any delay beyond December as an outlier rather than a plausible outcome.
Historical release cadence supports this confidence: Claude Opus 4.8 launched on 28 May 2026, following Opus 4.7 in early 2026 and 4.6 earlier still, establishing a six-to-eight-week flagship cycle [1][2]. Comparable point-bump refreshes have consistently hit public beta within weeks, not months, and Anthropic has not confirmed a new generation yet, pointing instead to a safeguarded Opus refresh alongside restored Mythos-class models [3]. This pattern suggests the next Opus variant will emerge quickly, reinforcing the high implied probability.
Key catalysts include Anthropic’s official roadmap updates and any announcement restoring the suspended Fable 5 and Mythos 5 models, which were halted on 12 June by a US export-control directive [3]. Traders should monitor the company’s newsroom for a point-bump Opus release, as the 2026 cadence implies movement in weeks [3]. A confirmed timeline for the next Opus variant would likely tighten the spread further, while any regulatory friction could introduce short-term volatility in token pricing.
Methodology
Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.
Resolution & payout
Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.
Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.
FAQ
- Where can I trade this market with the lowest fees?
- Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- How does resolution work?
- Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.
- What's the difference between YES and NO shares?
- A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.
- How fast are USDC deposits?
- Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.
- Do I need to KYC for this market?
- On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.
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